System of ventilation



A. W. STEWART.

SYSTEM OF VENTILATION.

APPLICATION FILED NOV.20,1917.

T 1 327 12Q Patented Jan. 6, 1920.

H EWoMSW ALEXANDER WILLIAM STEWART, 0F GLASGOW, SCOTLAND.

SYSTEM OF VENTILATION.

Specification of Letters Patent.

Patented J an.. 6, 1920.

Application filed November 20, 1917. Serial No. 202,943.

To all whom it may concern:

Be it known that I, ALEXANDER WILLIAM STEWART, a subject of the King of the United Kingdom of Great Britain and Ireland, and residing at Glasgow, Scotland, have invented a certain new and useful Improvement in Systems of Ventilation, of which the following is a specification.

This invention relates to an improved system of ventilation, and more particularly to a system of ventilation for ships, for withdrawing foul air from cabins, machinery compartments, holds, etc., and discharging it into the atmosphere.

The improved system of ventilation provides for withdrawal of foul air partly by direct suction, as by means of a fan for example, and partly by eduction, the dis charge from the fan inducing the flow of an additional volume of foul air.

The arrangement provided dispenses with the employment of trunking leading to the intake side of the fan, and, besides efi'ecting economy from the point of view of cost of installation, effects a notable increase in effioiency.

The figure of the accompanying drawing illustrates diagrammatically by way of example one suitable arrangement according to the invention.

In the embodiment of the invention illustrated there is provided at a suitable position, for example on one of the decks of a ship a fan 1 (or several fans may be pro vided) The intake side of the fan 1 is open to a compartment 2 or the like containing foul air, and receiving fresh air from a ventilator 3.

The discharge from the fan 1 is taken not direct into the atmosphere but into an air eductor 4 (or eductors).

The eductor 4: (or each such eductor) extends from a compartment or the like such as 5 to the atmosphere, being constructed as a double truncated cone having opposed bases, in the constricted region of which double cone is a nozzle 6 coaxial with the cone and directed toward the atmosphere, the nozzle functioning as an ejector and being connected to the discharge side of the fan.

A ventilator 7 supplies fresh air to the compartment 5.

It will thus be seen that air discharged by the fan 1 and issuing from the nozzle 6 will induce an additional volume of foul air to flow through the eductor 4 to the atmosphere the total volume of foul air discharged-being a multiple of that passing through the fan 1.

The fan or fans employed may discharge into a trunk common to a number of eductors.

For the purpose of the present description the device acting directly on the air is referred to as a fan; in practice, a blower or equivalent device may be employed for the purpose.

What I claim is In combination, two compartments, a ventilator for each compartment, a fan having its intake side in communication with one of said compartments, an air eductor constituted by a double truncated cone in communication with and projecting from the other compartment and a nozzle located adjacent to the plane of truncation of said air eductor and directed away from said last mentioned compartment, said nozzle comifnunicating with the discharge side of said In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALEXANDER WILLIAM STEWART.

Witnesses:

HENRY MAsoN, FLORENCE HOUSTON. 

